Device for grinding broken paper.



\ PATBN'IED JUNI: 9.1903.

R. DIETRICH.

I DEVICE PoR GRINIIING BROKEN PAPER.

APPLIOATION FILED SEPT. 2, 1902.

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N0 MODEL.

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lNo. 730,61*?.

PATENTED JUNE 9, 1903.

R. DIETRICH. DEVICE VFOR GRINDING BROKEN PAPER.

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APPLIUATION FILED SEPT. 2 1902. K

N0 MODEL.

WMZ.

UNITED STATES Patented June 9, 1903.

PATENT lOFFICEe vROBERT DIETRICH, oEMERsERIIRe, GERMANY.

DVICE FOR GVRI'NDINKG BROKEN PAPER.

SPECIFICATION forming' part of Letters Patent N 0. 730,617, dated June 9, 190%.l

i Application led September 2, 1902'. Serial No. 121,769. (No model.)

To all whom, t may concern:

Be itv known that l, ROBERT DIETRICH, manufacturer, a subject of the King of Prussia, German Emperor,l residing inthe city of Merseburg, Kingdom of Prussia, German Empire, have invented a certain new and useful Device for Grinding Broken Paper and the Like in the Manufacture of Paper, of which the following is a specification.

This invention has reference to a kneading and mixing machinepsuitable for the perfeet combination and grinding of so-called broken paper, cellulose, ground wood, and similar material for the manufacture of paper. My invention is superior to the devices of this kind as heretofore employed by the chips of paper being caught and pulled into the device with absolute reliability, so that an abundant supply of a good and uniform pulp can be obtained in a short time ready to go on the paper-machine. A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a longitudinal sectional eleva;- tion of the improvement. Fig. 2 is a transverse section of the same on the line 2 2 of Fig. l, and Fig. 3 is a like View of the same on the line 3 3 of Fig. l.

Referring to the drawings, a is a hopper through which the raw material is fed into the mixing-cylinder, forming part of the ma-v chine and arranged underneath the said hop.- per. The cylindrical casing b is provided at the interior of its side walls with several plates or rows of toothed knives c. As will be seen from Fig. 2, the knives, blades, teeth, and the like may be dierently arranged upon their base-plates, which are preferably mounted upon the walls, so as to insure perfect grinding. The driving-shaft d passes longitudinally through the machine and is provided at the inside of the -casing b with a screw-shaped kneading device e, the wingshaped parts of which may be compared to arms and hands and are fitted with indentations f at their extremities. By means of these prongs, teeth, points, or indentations the kneading-screw with its projections reachinginto the freshly-fed mass of broken paper will be sure to catch all the particles of the 'material and carry them along with it. Any coarser impurities, knots, particles of iron chips, and other foreign matter which might have got into the material, fed to the kneader by accident, has to be separated out at the proper time, so as to avoid breaking the knives and wings. .For this purpose l provide at the bottom of the. casing b a stonecatching basin or knotreceptacle g, into which all the heavy particles, stones, iron, and the like will drop beyond the reach of the Wings, which will thereby be unable to carry them up again. ing-screw between the Wings is provided with separate screw-threads h, by means of which the material is carried Valong in the direction of the right-hand side of the drawings. The kneading-screw e, with its wings, is preferabiy so arranged as to make ninety to one hundred revolutions a minute. At this rapid rotation a volume of air accumulates beneath the-upperA thicker portion of the mass of broken paper contained in the hopper, this air which collects in the casing b being subjected to a steadily increasing pressure. In other parts of the mass a partial vacuum is formed. These inconveniences greatly interfere with the taking out of the light paperpulp and with its being fed to the conical drumY t' by the delivery-opening at the righthand side of the casing. ln order to overcome this difculty and in order to insure absolute reliability ofy Working, provision is made whereby thevariations in the pressure of therair consequent upon the blows of the wings f within the casing are counterbalanecd, thereby insuring the absolutely uniform movement of the comminuted parts of broken paper. With this end in'view the rim of the casing b, which 4'projects beyond the drum t, is provided'V with one or more openings n above thedrurn and between the grinding-plates c. Air-boxes o are rigidly secured in place infront of these openings, the said air-boxes opening into the drum and being preferably provided at their upper parts p with pipes r, through which the air may escape from the casing or through which any rarefaction of the air may be compensated.

The hub of the kneadl TOO By the interposition of the said boxes o the pulp is prevented from entering into the pipes for the escape of the air. The delivery-openings 72,1eadiug from the casing b to the boxes o, are covered with grates or sieves s, which allow the comminuted pulp to pass through, while the crude chips of broken paper are retained, the pulp after being ejected from the casing being allowed to drop from the boxes into the drum. The combination with the said lateral boxes presents the further advantage ofcatching and retaining any parts of ropes, strings, rags, and the like which might have got into the hopper with the broken paper to the ground. These longiibered impurities if allowed to pass through all the other stages of manufacture are liable to choke up the knotters or strainers, inasmuch as they are usually not sufficiently disintegrated bythe short grindingin the beaterengine.

Gratos s s are attached to the openings n and between the grinding-plates. Any parts of strings and of similar long fibrous impurities which have not yet been removed by being twisted about the arms of the kneadingscrew will be caught at these grates and be retained thereby. The lids` p of the boxes may then be swung open and the attendant can reach through the open box o and get at the grate s and remove any particles which have adhered to said grates by hand even while the machine is'in operation. The cleaning of the kneading-screw, however, has to be effected while the machine is stopped.

After the chips of broken paper have been prepared by the means above described they are passed for their final treatment to the conical drum t', the narrower end of which is fitted around the deliveryopening of the kneading device e, so that the material may be conveniently caught and acted upon by the special attachments of the shaft d. Grinding-knives and the like, similar to those of the mixing-cylinder, are provided at the end wall 7o of the drum next to the mixer. The drum may be round or polygonal and is provided at the inside of its casing with several rows of knives, teeth, prongs, or with similar projections l, reaching into the interior of the drum and placed longitudinally, while the framework mv, which is' mounted upon the longitudinal shaft CZ, is also provided with a similar arrangement of knives or teeth, which enter into the spaces between the projections on the outer drum-casing. Both parts of the drum are closer together toward the rear end of the machine.

In the device arranged as above described the chips of broken paper which are fed through the hopper are sure to be caught by the indented or cut-out armsor wings of the kneading-screw of the first-described part. They are then carried around and are nicely cutrby the attachments of the shaft and by the aid of the knives and teeth of the grinding-plates and without leaving a residue, the

process being greatly assisted by filling the casing partially with water. In View of the absolutely-reliable action of the grinding parts there is no possibility of sticking of parts of paper, as it is of frequent occurrence in other devices used for this purpose. After the material has been sufficiently disintegrated the materia-l from which the impurities have been separated out in the stonecatching basin is transferred to the adjoining drum and is passed between the prongs or projections of the casing of the same and those of the framework mounted on the shaft. The previously-ground soaked mass, which is `free from impurities, is submitted to a thorough crushing action and to thorough kneading with a minimum of power and leaves the broader end of the drum as a uniform pulp ready for further treatment on the paper-machine or in the tub.

What I claim, and desire to secure by Letters Patent of the United States, is-

l. Machine for comminuting broken paper, and similar material for the manufacture of paper, comprising the combination of a mixing-cylinder b, the shaft d of which is provided with wings f for mixing and tearing up the material, and a feeding-screw h with a conical kneading-drum t', the narrower end of which is attached to the mixing-cylinder.

2. Machine for comminuting broken paper, consisting of a mixing-cylinder with wings f upon a shaft, and finger-shaped projections on the said wings which are cut out to form blades, in combination with grinding-plates at the side walls of the casing, which plates are provided with cutters and in combination with a conical kneading-drum for the reception of the comminuted mixture.

3. Comminuting-machineforbroken paper, comprising the combination of a mixing-cylinder with a conical kneading-drum and a feeding-screw h upon a common shaft and delivering means extending in the direction of the conical drum. f

4. Comminuting-machine for `broken paper comprising in combination a mixing-cylinder with wings upon the shaft of the same, the ends of the wings being cut out, and grinding-knives fastened to plates at the walls of the cylinder, and a kneading-drum, the narrower end of which is attached to the said cylinder, the shaft and the outer wall being provided with projections Z, m, the distance between the outer wall and the rotating part decreasing toward the rear end.

5. Machine for comminuting broken paper, comprising in combination a mixing-cylinder with cutting-blades upon the shaft and comminuting and cutting knife-plates upon the inner walls and a kneading-drum, the end Wall lc of which next to the cylinder is also provided with cutting means.

6. Machine for comminuting broken paper, comprising in combination a mixing-cylinder and an adjoining kneading-drum, with openings n in the upper part of said cylinder and ICO boxes o arranged upon the drum fi and in front of the said openings, and air-pipes fron said boxes.

7. Machine for comminuting broken and Waste paper, comprising in combination a mixing-cylinder in a casing and an adjoining conical kneading-drum, and air-boxes o upon the said drum with openings fm, in the upper part of the said casing in front of the airboxes, and grates s in front of the openings and swinging lidsp upon the boxes.

8. Machine for comminnting broken and Waste paper comprising in .combination a mixing-cylinder b with wings and screw upon the shaft d, a conical kneading-drum fitting around the delivery-opening of the mixingcylinder, and a receptacle, basin or box for retaining stones g below the mixing-cylinder for the purpose of depositing and separating the heavier particles from the waste.

9. A machine of the class described, comprising a kneading device and a mixing device, the kneading device having a casing at the apex end of the conical shell of the mixing-machine, knives on the inner faces of the heads of the casing, a driven shaft extending centrally through the casing and the shell, a kneading device on the shaft within the casing, and a plug onpthe shaft Within the said shell, as set forth.

10. A machine of the class described, comprlsing a kneading device and a mixing device, the kneading device having a casing at the apex end of the conical shell of the mixing-machine, knives on the inner faces of the heads of the casing, a driven shaft extending centrally through the casing and the shell, a

kneading device on the shaftwithin the casl ing, a plug on the shaft within the said shell, and air-boxes having grated openings in their sides leading into the casing and openings in the bottom leading into the shell, as set forth.

1l. A machine of the class described,^provided with a cylindrical casing having a feedhopper, spaced knives on the inner faces of the heads of the casing, and a revoluble screw-shaped kneading device Within the casing, having wings provided with indenta- 12. A machine of the class described, provided with a cylindrical casing having a feedhopper, spaced knives on the inner faces of the heads of the casing, and a revolnble screw-shaped kneading device within the casing, having wings provided with indentations, the said kneading device having its hub provided With screw-threads between the` said Wings, for carrying the material through a central opening in one of the headsv of the casing, as set forth.

13. A machine of the class described, provided with a cylindrical casing having a feedhopper, spaced knives on the inner faces of the heads of the casing, a revolnble screwshaped kneading device Within the casing,.

having wings provided with indentations, and air-boxes outside of one of the heads, having grated openings extending through the head into the interior of the casing, as set forth.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses. l

` -ROBERT DIETRICH.

Witnesses:

FREDERICK J. DIETZMAN, B. H. WARNER, Jr. 

